Open access

Medical Calculators


OpenEpi is free and open source software for epidemiologic statistics.

CEBM – CATMaker and EBM Calculators

CATmaker is a computer-assisted critical appraisal tool developed by the Centre for Evidence-Based Medicine (CEBM) - University of Oxford. It helps the creation of Critically Appraised Topics (CATs) for key articles about Therapy, Diagnosis, Prognosis, Etiology/Harm and Systematic Reviews of Therapy.


Easy to use medical calculator with formulas in most medical specialties.

Medscape – Medical Calculators (free registration required)

Medscape is an outstanding free medical resource with vast content in all medical specialties and has a section on medical calculators.

Epocrates Online – MedCalc (free registration required)

Besides its world famous free drug database, epocrates online offers access to a medical calculator with a vast range of medical formulas in all specialties.

Charlie’s Clinical Calculators

Easy to use medical calculator with formulas in most medical specialties.

ACC/AHA CV Risk Calculator

This tool is a companion to the 2013 ACC/AHA Guideline on the Assessment of Cardiovascular Risk. It enables health care providers and patients to estimate 10-year and lifetime risks for atherosclerotic cardiovascular disease.

QRISK2-2016 Cardiovascular Disease Risk Calculator

QRISK2-2016 Cardiovascular Disease Risk Calculator is based on information collected on over 2 million patients registered in 550 general practices in the UK and includes other risk factors not present in the Framinghan risk assessment tool such as atrial fibrillation, rheumatoid arthritis, body mass index, chronic renal failure and diabetes. The tool includes a chart that is very helpful to explain to patients their actual risk and their risk relative to others.

ASSIGN Cardiovascular Risk Score

The ASSIGN is a cardiovascular risk score based on research with Scottish men and women and was launched for use alongside SIGN (Scottish Intercollegiate Guidelines Network) guidelines on lipid management.

U.S. Preventive Services Task Force – Search for Recommendations

Very interesting mechanism to retrieve recommendations from the USPSTF Preventive Services Database according to the patient’s characteristics.

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